Washington ? The toll from salmonella-tainted tomatoes jumped to 228 illnesses Thursday as the government learned of five dozen previously unknown cases and said it is possible the food poisoning contributed to a cancer patient’s death.

Six more states – Florida, Georgia, Missouri, New York, Tennessee and Vermont – reported illnesses related to the outbreak, bringing the number of affected states to 23.

The Food and Drug Administration has not pinpointed the source of the outbreak. With the latest known illness striking on June 1, officials also are not sure if all the tainted tomatoes are off the market.